Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d1d5e0c272fd36…

MALICIOUS

PDF

59.0 KB Created: 2020-08-31 20:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d5b80c852a123a9543fcc246d81d8ca SHA-1: 38edaabf0a2889bb502b7999afc941772ac5f5cd SHA-256: 66d1d5e0c272fd36c04b473fcc2d6e42a7a790b90f093a5646fb7df8c5f775f3
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as an incident report lookup. The document body, though heavily obfuscated, contains text related to 'Harris county incident report lookup' and the malicious URL. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm designed to obscure the ultimate destination. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=harris+county+incident+report+lookup
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/7478/0312/files/59812044515.pdf
    • https://cdn.shopify.com/s/files/1/0435/8792/8223/files/bella_y_la_bestia_cuento.pdf
    • https://cdn.shopify.com/s/files/1/0435/9775/8622/files/32652237043.pdf
    • https://cdn.shopify.com/s/files/1/0448/2105/3600/files/variance_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0448/7489/1431/files/casted_course_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/7206/8520/files/blood_relation_questions_bankers_adda.pdf
    • https://cdn.shopify.com/s/files/1/0439/3821/8152/files/kijomevagukagute.pdf
    • https://cdn.shopify.com/s/files/1/0431/7272/4897/files/nenupotitexubenefil.pdf
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/19991686029.pdf
    • https://static.usrfiles.com/ugd/cd79e3_2afd5a87ac9d4fc4b46970eb406c474b.pdf
    • https://static.usrfiles.com/ugd/f09a9d_ee55284d0c2a49a3b67eb874058ab6c8.pdf
    • https://static.usrfiles.com/ugd/c5d40f_406eb813281744bb8a7b2cbe54861f40.pdf
    • https://static.usrfiles.com/ugd/b8c837_25a6bb1d7c204d19aa612d7f8767dc19.pdf
    • https://static.usrfiles.com/ugd/95089d_f6ef6413deb84aad8da828e46387cd0d.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009161.bin
c7d01372696b7677f75a4d51f952607921482792a7e7fef2910af95bc8ec41e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9161 5076 bytes
font_01_sfnt_off0000a2ab.bin
c784c2618ca3385de18d42aa04b9671f12b918fa304ee729bf804386cb4479a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2AB 14796 bytes
font_02_sfnt_off0000d0b5.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B5 4324 bytes

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